/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.client.android;

import android.content.ActivityNotFoundException;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.BitmapFactory;
import android.provider.Browser;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.DecodeHintType;
import com.google.zxing.Result;
import com.google.zxing.client.android.camera.CameraManager;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;

import java.util.Collection;
import java.util.Map;

/**
 * This class handles all the messaging which comprises the state machine for capture.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class CaptureActivityHandler extends Handler {

  private static final String TAG = CaptureActivityHandler.class.getSimpleName();

  private final CaptureActivity activity;
  private final DecodeThread decodeThread;
  private State state;
  private final CameraManager cameraManager;

  private enum State {
    PREVIEW,
    SUCCESS,
    DONE
  }

  CaptureActivityHandler(CaptureActivity activity,
                         Collection<BarcodeFormat> decodeFormats,
                         Map<DecodeHintType,?> baseHints,
                         String characterSet,
                         CameraManager cameraManager) {
    this.activity = activity;
    decodeThread = new DecodeThread(activity, decodeFormats, baseHints, characterSet,
        new ViewfinderResultPointCallback(activity.getViewfinderView()));
    decodeThread.start();
    state = State.SUCCESS;

    // Start ourselves capturing previews and decoding.
    this.cameraManager = cameraManager;
    cameraManager.startPreview();
    restartPreviewAndDecode();
  }

  @Override
  public void handleMessage(Message message) {
	  
	  if (message.what == R.id.restart_preview){
		  restartPreviewAndDecode();
	 } else if (message.what == R.id.decode_succeeded){
		 state = State.SUCCESS;
	        Bundle bundle = message.getData();
	        Bitmap barcode = null;
	        float scaleFactor = 1.0f;
	        if (bundle != null) {
	          byte[] compressedBitmap = bundle.getByteArray(DecodeThread.BARCODE_BITMAP);
	          if (compressedBitmap != null) {
	            barcode = BitmapFactory.decodeByteArray(compressedBitmap, 0, compressedBitmap.length, null);
	            // Mutable copy:
	            barcode = barcode.copy(Bitmap.Config.ARGB_8888, true);
	          }
	          scaleFactor = bundle.getFloat(DecodeThread.BARCODE_SCALED_FACTOR);          
	        }
	        activity.handleDecode((Result) message.obj, barcode, scaleFactor);
	 } else if (message.what == R.id.decode_failed){
		 state = State.PREVIEW;
	     cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
	 } else if (message.what == R.id.return_scan_result){
		 activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
	        activity.finish();
	 } else if (message.what == R.id.launch_product_query){
		 String url = (String) message.obj;

	        Intent intent = new Intent(Intent.ACTION_VIEW);
	        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
	        intent.setData(Uri.parse(url));

	        ResolveInfo resolveInfo =
	            activity.getPackageManager().resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);
	        String browserPackageName = null;
	        if (resolveInfo != null && resolveInfo.activityInfo != null) {
	          browserPackageName = resolveInfo.activityInfo.packageName;
	          Log.d(TAG, "Using browser in package " + browserPackageName);
	        }

	        // Needed for default Android browser / Chrome only apparently
	        if ("com.android.browser".equals(browserPackageName) || "com.android.chrome".equals(browserPackageName)) {
	          intent.setPackage(browserPackageName);
	          intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
	          intent.putExtra(Browser.EXTRA_APPLICATION_ID, browserPackageName);
	        }

	        try {
	          activity.startActivity(intent);
	        } catch (ActivityNotFoundException ignored) {
	          Log.w(TAG, "Can't find anything to handle VIEW of URI " + url);
	        }
	 }
  }

  public void quitSynchronously() {
    state = State.DONE;
    cameraManager.stopPreview();
    Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
    quit.sendToTarget();
    try {
      // Wait at most half a second; should be enough time, and onPause() will timeout quickly
      decodeThread.join(500L);
    } catch (InterruptedException e) {
      // continue
    }

    // Be absolutely sure we don't send any queued up messages
    removeMessages(R.id.decode_succeeded);
    removeMessages(R.id.decode_failed);
  }

  private void restartPreviewAndDecode() {
    if (state == State.SUCCESS) {
      state = State.PREVIEW;
      cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
      activity.drawViewfinder();
    }
  }

}
